Upgrade GitHub Actions and Python versions - #1281

  1 files  ±0    1 suites  ±0   7m 1s ⏱️ + 1m 15s
838 tests ±0  837 ✅ ±0  1 💤 ±0  0 ❌ ±0 
849 runs  ±0  848 ✅ ±0  1 💤 ±0  0 ❌ ±0 

Results for commit 7c12d81. ± Comparison against earlier commit 3c74965.